2-3/8 in 2-3/4 in NBR Circular Torus Shape O-Ring

The O-rings of Freudenberg Sealing Technologies are used for the static sealing of idling machine parts against liquids and gases. The versatile applications include water fittings, air conditioners, vehicle engines or dentist drills. In addition, the classic O-ring seal is also available in special shapes, making it suitable as a dynamic sealing element, for example as piston or rod seals in hydraulics. O-rings are manufactured from a wide variety of materials for all requirements.

• Good chemical resistance to mineral oils and greases
• The physical and chemical resistance properties of NBR materials are determined by the acrylonitrile (ACN) content of the base polymer which can vary between 18 and 50%
• Low ACN content ensures good flexibility at low temperatures, but offers limited resistance to oils and fuels
• As the ACN content increases, the low temperature flexibility reduces and the resistance to oils and fuels improves
• Physical and chemical resistance properties of NBR materials are also affected by the cure system of the polymer
• Peroxide cured materials have improved physical properties, chemical resistance and thermal properties as compared to sulfur-donor-cured materials
• Standard grades of NBR are typically resistant to mineral oil-based lubricants and greases, many grades of hydraulic fluids, aliphatic hydrocarbons, silicone oils and greases and water to about 80 deg C
• NBR is generally not resistant to aromatic and chlorinated hydrocarbons, fuels with a high aromatic content, polar solvents, glycol based brake fluids and non-flammable hydraulic fluids (HFD)
• NBR also has low resistance to ozone, weathering and aging, but in many applications this has no negative effect